I would never ever use such language in work email. You are always one wrong click away from everything being sent to your clients or to the whole wide world. There's a "New York Times principle" applicable to work emails - don't write anything you couldn't deal with if it were on the front page of the New York Times.

Now, if I were talking one on one with peers over beers, that's a different matter. There is much more freedom and it would allow some things said which are not meant to be heard by anybody not in the audience.

> People everywhere bitch about the outsiders they have to deal with in language that would never be used in business proper.

This is not exactly business - those are people that pretend to be champions of those "needy latinos" and represent them. It's a higher bar than just business transaction - I would have no problem doing business with a person I disagree with on everything and who maybe secretly hates me, as long as the business end is fine I'm fine. But I probably prefer to choose somebody else to represent me and speak for me.